17
5.3 Wide Field Photo Tube for M-Plan
Objectives
The trinocular phototube 50/50 with image
erection is especially suited for visual
observation as well as photo and TV
documentation at the same time. For an optimal
view the visual optical path is equipped with a
30° angle.
The photo exit with a 0,8x magnification factor
means an according field of view adjustment for
a efficient pixel saturation and a wide
unvignetted image field.
pic.12: wide field photo tube
∞
1x/0,8x
6. Measuring
instruments
6.1. Eyepiece measuring plate
The eyepiece measuring plates are provided
and a measuring scale is inserted into a
adjustable eyepiece
.
The eyepiece - cross-line
divides the field of view into 4 quadrants and
marks the field of views centre. To use the
eyepiece measuring plates the eyepiece - line
disk version is unscrewed, and the line plate is
inserted in such a way into these that the
engraving points downward to the object.
When connecting, the screen is again screwed
in.
6.2. Object measuring plate
The Object measuring plate serves for the
calibration of the measuring software for normal
and as well as for microscopic linear
measurements. The division is on the top side of
the plate. For calibrating, the division is turned to
the objective. For direct linear
measurement of
even objects these are placed on the object
measuring plate with the division downward on
the object surface.
The object - surface plate 70/0.5 10/0.1
2/0.01 orders a calibration of 0.5mm and in
the centre a division length of 10 mm with a
calibration of 0.1 mm on a division length of
70mm. Moreover it orders a division of 2.0mm
with a calibration of 0.01mm additionally in the
centre of this division.
6.3. Measuring software
Objects can be captured with a video- or photo
camera which is mounted directly on a
microscope. These captured objects can be
stored in digital form. After a calibration of the
whole microscope system (with help of a
measuring plate) it is possible to measure this
objects.
Several measuring programs are available. For
the use of these programs it is necessary to
equip a computer with digital camera like a
digital USB camera or a digital D-SLR camera to
the microscope (over the Photo-/TV tube).
The measuring programs will be describe
separately in the manual of the manufacturer of
the software (the manual is not part of this
manual).
